Opera before 11.62 allows remote attackers to bypass the Same Origin Policy via the (1) history.pushState and (2) history.replaceState functions in conjunction with cross-domain frames, leading to unintended read access to history.state information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/74351
http://www.opera.com/support/kb/view/1012/
http://www.opera.com/docs/changelogs/windows/1162/
http://www.opera.com/docs/changelogs/unix/1162/
http://www.opera.com/docs/changelogs/mac/1162/
http://secunia.com/advisories/48535
http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00012.html